MOTU 896 User's Guide download pdf (Page 33)

INSTALLING THE 896MK3 HARDWARE

SYNCING WORD CLOCK DEVICES

The 896mk3 word clock connectors allow you to

synchronize it with a wide variety of other word

clock-equipped devices.

For standard word clock sync, you need to choose

an audio clock master (as explained in “Be sure to

choose a digital audio clock master” on page 28).

In the simplest case, you have two devices and one

is the word clock master and the other is the slave

as shown below in Figure 4-18 and Figure 4-19.

Figure 4-18: Slaving another digital audio device to the 896mk3 via

word clock. For the 896mk3 clock source, choose any source besides

word clock, as it is not advisable to chain word clock.

Figure 4-19: Slaving the 896mk3 to word clock. For the 896mk3 clock

source, choose ‘Word Clock In’.

Don’t chain word clock

If you have three or more digital audio devices that

you need to synchronize, avoid chaining their word

clock connections (OUT to IN, OUT to IN, etc.), as

this causes problems. Instead, use a dedicated

synchronizer like the Digital Timepiece or a word

clock distribution device of some kind.

Slaving to a 2x and 1/2x word clock

All MOTU FireWire audio interfaces that support

96 kHz operation have the ability to slave to a word

clock signal running at either one half or one

quarter of their current clock rate. For example, the

896mk3 could be running at 96 kHz while slaving

to a 48 kHz word clock signal. Similarly, the

896mk3 could run at 88.2 kHz and slave to

44.1 kHz word clock.

Remember, the word clock signal must be one of

the following:

■ the same as the 896mk3 clock

■ half of the 896mk3 clock

Forcing a 1x word out rate

The 896mk3 can generate a word clock output

signal that either matches the current system clock

rate (any rate between 44.1 and 192kHz) or the

corresponding 1x rate. For example, if the 896mk3

is operating at 192kHz, you can choose to generate

a word out rate of 48kHz. For details on how to

make this word clock output setting, see “Word

Out” on page 47.

Master

Slave

Word clock OUT

Word clock IN

Other device

896mk3

Audio

Clock

Master

Slave

MOTU Digital Timepiece universal synchronizer

Word clock OUT

Word clock IN

896mk3

896mk3 Hybrid book Page 33 Friday, August 19, 2011 1:44 PM

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MOTU 896 User's Guide Page 33

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